With the improvement of computer graphic hardware capability, the algorithm of 3D terrain rendering is going into the
hot topic of real-time visualization. In order to solve conflict between the rendering speed and reality of rendering, this
paper gives an improved method of terrain rendering which improves the traditional continuous level of detail technique
based on fractal theory. This method proposes that the program needn't to operate the memory repeatedly to obtain
different resolution terrain model, instead, obtains the fractal characteristic parameters of different region according to
the movement of the viewpoint. Experimental results show that the method guarantees the authenticity of landscape, and
increases the real-time 3D terrain rendering speed.